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I am designing an attic build out within attached garage and want to insulate the roof between 2X6 rafters on 24IC. I am looking at R-30 rigid insulation to put between the rafters before drywall finish on the attic ceiling.


Rigid Polyisocyanurate Thermal Insulation Board). As part of that standard, the products must meet R-value requirements presented as Long-Term Thermal Resistance (LTTR). As foam ages over time, air and blowing agents diffuse in and out of the foam structure, resulting in reduced R-value.


What Is the Thickness of R30 Rigid Insulation? The thickness of R-30 insulation varies, depending on the type of insulation used. Fiberglass panels and rolls with an R-30 insulation value have a typical thickness of eight to nine and a half inches.

www2.owenscorning.com/literature/pdfs/[02] FOAMULAR XPS Roof Insulation for Commercial...

FOAMULAR® XPS ROOF INSULATION FOR COMMERCIAL BUILDINGS PAGE 5 FOAMULAR® XPS ROOF INSULATION FOR COMMERCIAL BUILDINGS FOAMULAR ® XPS insulation is a rigid foam insulation which meets the needs of today’s design professionals for a truly sustainable insulation product. Owens Corning™ insulation products help improve thermal performance and control moisture in commercial, institutional and ...


Owens Corning® FOAMULAR® THERMAPINK® Extruded Polystyrene (XPS) Insulation is a closed cell, moisture resistant rigid foam board specially designed for roofing applications.


The average cost of flat roof insulation is $0.67 per square foot (for 1 inch thick PolyISO with 6-R value). High quality rigid foam insulation that is properly installed will greatly improve ventilation, eliminate drastic temperature fluctuations inside the home, and protect from leaks. Here are the best insulation materials along with prices, features, and r values.


Section R402.2.2 Ceilings without attic spaces. Where the prescriptive requirements would require more than R-30 insulation but the roof/ceiling configuration cannot accommodate the insulation level indicated by the prescriptive requirements, R-30 is the minimum insulation requirement.


Benefits of EnergyGuard™ Polyiso Roof Insulation include: Excellent “LTTR” value compared to any other FM Class 1 rated products of equivalent thickness. FM approved, subject to the conditions of approval as a roof insulation when installed as shown in the current edition of the Factory Mutual Research Approvals Guide.


ACFoam ® Recover Board is manufactured and tested for use in recover applications, ACFoam Recover Board is a rigid polyiso roof insulation faced with inorganic coated polymer-bonded glass fiber mat facers. Recover Board is a thermally efficient and dimensionally stable recover board solution.


Best Selling Insulation. FOAMULAR® 250 2 in x 2 ft x 8 ft R-10 Tongue & Groove Edge Insulation Sheathing As low as $13.98/board; FOAMULAR® 250 2 in. x 4 ft. x 8 ft. R-10 Tongue & Groove Edge Insulation Sheathing As low as $27.96/board; FOAMULAR® 600 2 in x 4 ft x 8 ft R-10 Squared Edge Insulation Sheathing As low as $49.11/board